Lock



FIG. 1 is a perspective view of a fourth embodiment of the design of the present invention;

FIG. 2 is a top view of the lock shown in FIG. 1;

FIG. 3 is a front view of the lock shown in FIG. 1;

FIG. 4 is a back view of the lock shown in FIG. 1;

FIG. 5 is a bottom view of the lock shown in FIG. 1;

FIG. 6 is a side view of the lock shown in FIG. 1; and,

FIG. 7 is a side view of the lock shown in FIG. 1.

The portions of the Figures shown in phantom lines are not part of the claimed design but are for illustration only. 

The ornamental design for a lock, as shown and described. 